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How to Fix Rolls Royce Dawn Key Fob Problems Few cars can elicit the kind of uncontrollable gasp that the Rolls-Royce Dawn can. Even with the roof made of cloth off, it's stunning. It is packed with all the typical gadgets, including motorised doors that can be shut by pressing a button. Umbrellas are concealed in the openings of the doors. It has an incredibly smooth V12 engine that can be driven in near silence. Dead Coin Battery The most common reason for a key fob to not unlock or lock the doors is a dead battery. It is also the most simple to repair as it can be replaced in several minutes. To avoid a damaged coin battery, make sure you use a new battery that is identical in size, voltage and specifications as the original one. Do not expose a battery to pure water, such as rain, clean tap-water, or even soda, because this can damage the internal chip. If the key fob isn't working try reprogramming the key using an original key or visit an authorized dealer. Damage to the Receiver Module, water issues, Signal Interference, and a damaged electronic chip are all other reasons that the key fob might not work. Poor Battery Contact The button cell battery in the key fob of your Rolls Royce Dawn can lose its charge and cease to function. It is easy to replace the battery. Be sure to replace the battery with one that is the same size and voltage. Ask The Key Lab at the auto parts store if you aren't sure what type of battery to purchase. The corrosion of the battery terminals in a Rolls Royce Dawn can also stop it from beginning. This is a common problem with older batteries, particularly those that haven't been charged for a long period of time. You can use a multimeter for checking the conductivity to determine if your terminals on your battery have rust. Set the meter at ohms, and place one probe against the negative terminal of your Dawn. Place the other probe on the surface of the engine or chassis. The reading should be near zero ohms. A clicking noise is another indicator of a weak Dawn battery. This is because starter solenoid, accessories and the engine require low voltage while the starter solenoid requires high current. Water Damage If you've accidentally dropped your Rolls Royce Dawn key fob in the sink or left it in the rain, it's likely to be suffering from water damage. The chip's electronic components are protected by rubber seals but prolonged exposure to clean ocean or salty water may cause it to stop functioning. Moisture can cause corrosion over time, leading to faulty circuitry, which can lead problems with the ignition and security system of your car. It can also interfere with signal transmission, causing the remote keyless system to fail. The key fob could disable your car or activate the immobiliser, leaving you stuck. To avoid this, remove the key fob from its case and wipe it clean with a an abrasive towel to eliminate any moisture. You can also place the key in an airtight container with uncooked rice or silica gel packets to to absorb any moisture that remains. After the key has dried it should function normally again. If the key doesn't work, it is most likely that the 12 volt batteries or receiver modules are responsible for the problem. These need to be replaced. Receiver Module Issues If you've already tried a different battery, but the remote key fob isn't working, it could be time to replace the receiver module. The receiver module receives radio frequency signals from your key fob, and converts them to commands for the car's electronic system. If the chip inside the module is damaged, the module will not be able to communicate with other modules of the vehicle. You'll need a scanner to diagnose the problem. It will be able to show what the computer on the vehicle is telling it. The battery in the key fob of your Dawn has metal clips that hold it in place and complete the circuit. These clips can get corroded and render the battery's contacts ineffective. When replacing the battery, ensure that it's exactly the same size and voltage as the original. Otherwise it could cause damage to the chip inside the key fob. If the key fob stops suddenly it could indicate that it has been damaged by water. The key fob could be damaged by water if it is dropped into water or immersed in soapy water. You can try to clean the key fob using isopropyl alcohol, or electronic cleaners, but if the chip in the key fob is fried you'll have to replace it. Signal Interference Occasionally, your Dawn key fob might stop working due to signal interference. The interference could be by objects in the vicinity of your vehicle, weather conditions, and transmitters operating on the same frequency band. A faulty receiver module can also cause interference. If you're unable to reduce the interference, you might want to try using an extender of range or signal booster. It is essential to replace the button cell battery inside your Dawn key fob in the event that it's depleted. The battery must be the same voltage, size and type as the original battery to ensure that your vehicle remains compatible with the key fob. If your key fob has stopped working, the chip could be fried. If you've tried all of the above methods but are still unable to get your key to open or lock, it's time to contact an experienced locksmith. A reliable locksmith will be able help you with any Rolls Royce key fob or key programming needs, such as the reprogramming and replacement. They can give you an estimate of the work needed. Ask the locksmith for their rates and credentials prior to hiring them. Dead 12 Volt Battery The 12 volt battery inside your Rolls Royce Dawn provides high current to start the engine as well as for all accessories and onboard computers. If the battery is in a dead state or the flow of power to the engine is interrupted due to corrosion of the battery's terminals, or the ground connection, all electronic components on board including the remote keyless system will cease to function. You can use a multimeter to test the conductivity of your Dawn battery. To test this, you must remove the negative cable of the battery and connect one probe of the Multimeter to ground wire of the battery. Then, apply the other probe of the Multimeter to any exposed metal parts of your vehicle, like the body, chassis, or engine. The reading should be in the vicinity of zero in ohms. If the results are not satisfactory, you can replace the battery with another one with the same voltage, size and specification. Be sure to fully charge the new battery prior to using it. The most common cause of the battery failing is internal degradation caused by old age but it can also be due to an excessive draw or if the car is parked for long periods of time.